Business Segments (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Segment Reporting Information [Line Items]
Operating revenues	$ 676,368	$ 607,074	$ 674,084
Cost of operating revenues	465,588	416,019	461,069
Gross profit	210,780	191,055	213,015
Operating expenses	122,656	114,447	110,831
Operating income	88,124	76,608	102,184
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	676,368	607,074	674,084
Cost of operating revenues	465,588	416,019	461,069
Gross profit	210,780	191,055	213,015
Operating expenses	87,479	84,513	78,979
Operating income	123,301	106,542	134,036
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating income	35,177	29,934	31,852
Irrigation [Member]
Segment Reporting Information [Line Items]
Operating revenues	568,000	513,896	586,031
Irrigation [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	568,000	513,896	586,031
Cost of operating revenues	402,126	358,390	401,427
Gross profit	165,874	155,506	184,604
Operating expenses	68,911	67,959	62,635
Operating income	96,963	87,547	121,969
Infrastructure [Member]
Segment Reporting Information [Line Items]
Operating revenues	108,368	93,178	88,053
Infrastructure [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	108,368	93,178	88,053
Cost of operating revenues	63,462	57,629	59,642
Gross profit	44,906	35,549	28,411
Operating expenses	18,568	16,554	16,344
Operating income	$ 26,338	$ 18,995	$ 12,067